element, 54 bytes

Result

AC

Duration

712ms

Code [DL]

!_0;_1;0{0~`#_2:1~=}0~`(\ ={\ `0~(#0;(\ =}0~1?{K`(\ =}

stdin

                           T                      
                                                  
                                                  
                                                  
                                                  
                                                  
                 K                                

stdout

                           T                      
                           T                      
                           T                      
                           T                      
                           T                      
                           T                      
                 KKKKKKKKKKK

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fff1fdfe480 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "/volume/CODE"], 0x563d94243d10 /* 7 vars */) = 0
11    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=11, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
12    execve("/bin/cat", ["cat", "-"], 0x563d94243d60 /* 7 vars */) = 0
13    execve("/usr/bin/perl", ["perl", "/root/element.plx", "!_0;_1;0{0~`#_2:1~=}0~`(\\ ={\\ `0"...], 0x563d9470b090 /* 7 vars */) = 0
12    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
13    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
10    +++ exited with 0 +++